Tool-clutching means for hammers and drills.



' www `C. H. HAESELER.

TooL CLUTCHING MEANS FOR HAMMl-:Rs AND uRlLLs.

APPLICATION FILED JULY 22,1914.

Patented May 2, 1916.

7/ Vif/121656695 ing or gripping the working tools of differpowerl hammers and CHARLES H. HAESELER, 0F PHILADELPHIA, IEI :IN'NSIYLVANIA.l

TOOL-CLUTCHING MEANS FOR HAMMERS AND DRILLS. i

Specification-of Letters Patent.

Patenten May a, wie.

Application led July 22, 1914. Serial No. 852,431.

To all 'whom z't may concern:

Be it known that I, CHARLES H. HAESE- Liana citizen of the UnitedStates, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Tool-Clutching Means' for Hammers and Drills, of which the following is a'specication.

y invention relates to means for clutchent kinds as used in drills and the object thereof is to provide simple and eliicient means o f this character capable of clutching or gripping tools having a collarless shank, that vis a shank of substantially uniform cross section and unprovided with .a collar or similar provision such as heretofore has been found necessary in order that the tool may beheld or secured in the hammer or drill.

In the present instance vmy invention is shown embodied in type whose reciprocating piston imparts its blows upon .the end of a drill steel lwhich is heldby said clutching means Aat the front end of the drill but 1n such manner that the drill .steel or bit together with the gripping or clutching means will move bodily to permit of the proper'action of the drill steel in the drilling operation. A hand operated device is provided for acting upon said means for disengaging the samefrom the drill steel to lpermit the latter to b eremoved from the dri The various features of novelty and utility inmy invention will b theA description hereinafter In the drawing, of a, drill embod lower part thereof in whichmy" invention resides being shown in section; Fig. 2 a plan view of the clutching means on a larger and with a por' tion of the top plate broken away; Fig. 3 t. top plane of said clutc the plate removed; Figs. 4, 5 and 6 sectlons on the line 4-4, 5 5 and 6-6 respectively of Fig. 3.

given. Figure 1 islan elevation vention embodied in a power hammer and in a hammer ofv the percussive type, yet 1t willbe understood that my invention is not limited tov the particular construction or type of instrument but that I contemplate using vmy invention wherever applicable.

- For convenience 1 provided -a central bore which is correspondingly the drill and arrangement of a drill of the percussive means constltuting ter casing is'itself 10 secured to the il e apparent from 4 ying my yinvention, the

ng means with'.

'in description of my inv ention I w1ll describe the same in connection with the particular type or construction of instrument shown.

The particular instrument illustrated in Fig. 1s a power hammer of the percussive type including a cylinder l in which reciprocates the usual piston, not shown, and

with a rotation motor contained within a casing 2 for rotating through suitable drlving connections a tool holder 3 whlch rotates upon the extension 4 of the cylinder. The drillbit or steel 5v is angular in cross section and the tool holder 3 has gular -to receive the drill bit tationsof the tool holder 3 steel. Th

so that the roare imparted -to e general construction parts above referred to are illustrated in my prior application filed June 8, 1914, Serial No. 843,724 forimprovements in gmachines.

The rotatable tool holder 3 is surrounded by a shell orec'asing 6 which is secured or clamped to the cylinder by means of the bolts 7. he outer end of the casing or shell is provided with a lateral liange 8 to w 'ch is ,secured a supplementary easin 9 containing the' tool clutching or gripplng my invention. This'latprovided with'a flange ange 8 in suitable ner as by means o the bolts 11.

The tool clutc or gripping means includes a block 12 having a central bore 13 correspondin intshae to the cross section of the drill itA 5\ which fits fairly within.

toward the central\ bore 13. These holes communicate with 'such b ore through V-shaped apertures 15 as show`n in Figs. 5 and 6 and contain balls 16 which are downwardly spring-,pressed by means of the springs 17 w ich bear at their lower or outer endsagainst the balls and at their upper endsagainst While I have preferred to show my iny a plate 1 8 secured to the top face of the block. These balls in their lowermost .position project into the central bore 13 or rather against opposite sides of the drill bit if inserted in such bore so that while thedrill bit may be forced inwardly freely the balls will grip the bit and prevent it from being withdrawn.

man-

The gripping. means above described are normally upwardly or inwardly springpressed within the cavity or chamber of the casing 9 by means of with the result the bit and the latter is thereby forced outcess 23 in the block 12 wardly the entir'e gripping means will move bodily in an outward direction by reason of its gripping action on the bit. The gripping means therefore has a limited or predetermined amount of movement which corresponds substantially with the amount of movement ordinarily possessed by a drill bit in actual operation and such gripping means are returned to normal position together with the drill bit by means of the spring 19.

For the purpose of releasing the gripping means or clutch from the drill bit to permit the latter to be withdrawn I provide suitable hand means which here consists of a sleeve 20 having a central bore through which the bit passes and which slides in and out of the front or outer end of the casing 9. This sleeve at its inner end is provided with a lateral flange 21 which seats against an inner annular shoulder 9aL of the casing' and is normally held in such position by means of the spring 19l interposed between such flange and the block 12.- This sleeve is pro vided with a longitudinal iange or extension 22 which is adapted to enter an annular reandin its extreme movement to come into contact with the balls 16 and to force the same upwardly out of clutching engagement with the drill bit. In operation the operator forces the sleeve 20 inwardly and thereby unclutches the drill bit whereupon the latter may be readily removed.

I claim: 1. In combination with a hammer of the percussive type, a casing at the front end thereof, a clutch device arranged within the casing to engage and hold the tool with respect to outward movement and mounted for bodily movement in a direction longitudinal of the tool, and resilient means for normally moving said clutch device inwardlywi the casing.

2. In combination with a hammer of the percussive type, a casing at the front end thereof, and a clutch device arranged withm' the casing to engage and hold the Itool with respect to outward movement and mounted for bodily movement in a direction longitudinalof the tool, said clutch device having means extraneous such device to unclutching position.

3. In combination with a hammer of the percussive type, a casin at the front end thereof, and a clutch device arranged within the casing` to engage and hold theJ tool with respect to outward movement and mounted for bodily movement in a direction longithe coiled spring 19 that when the piston strikes -within the casing for hol of the casing .for moving tudinal or thermal, Said durch device being normallyheld 'inwardly within the casing with a yielding pressure.- *if* 4. In combination with a hammer ofthe percussive type, thereof, and a clutch device arranged within the casing to engage and hold the tool with respect to outward movement and mounted for bodily movement in a-'direction long tudinal of the tool, and a g the clutch device inwardly with a yielding pressure. 5. In combination with a hammer of the percussive type, a casing at the front end thereof, and a clutch device arranged withso in the casing to engage and hold the tool with respect to outward movement and mounted for bodily movement in a direction longitudinal of the tool, said device including a block provided with a bore to re- 35 ceive the'tool shank and movable clutch members arranged within the block and adapted to project into 4said bore' and to grip the tool shank.

6. In combination with percussive type, a casing at the front end thereof, and a clutch device arranged within the casing to engage and hold the tool with `respect to loutward movement .and I mounted for bodily movement m a direc-,95 tion longitudinal of the tool, said device including a block provided with a bore to receive the tool shank and also provided with circular holes one side'of which enters said bore, and springpressed balls in said 100 holes and projecting into the bore to grip the tool shank.

7. In combination with percussive type, a casing a hammer of the at the front end thereof, and a clutch device arranged with- 105 in the casing to engage and holdthe tool with respect to outward movement and mounted for bodily movement in a direction longitudinal of the tool, said device including a block provided with a bore to 11u receive the tool shank and movable clutch members arranged within the block and adapted to project into said bore and to grip the tool shank, and a, spring for holding the block inwardly within the-.casing with a 111 yielding pressure.

8. In combination percussive type, a casing atthe front end thereof, and a clutch device arranged within with a hammer of the the casing to engage and hold the tool with 12 respect to outward movement and mounted for bodily movement in a direction longitudinal of the tool, said device including a block provided with a bore to receive the tool shank. and movable `clutch. members ar- 1i ranged within the block and adapted to project into said bore and to grip the tool shank, and a hand piece movable within the casingv and extending extraneous thereof and adapted to be a casing at the front end 7o spring arranged a hammer of the projected agalnst the 1l clutch members to force them from gripping engagement with the tool shank.

9. In combination with a hammer ofthe percussive type, a casing at the front end thereof, and a clutch device arranged within the casing to engage and hold the tool with respect to outward movement and mounted for bodily movement in a direction longitudinal of the tool, said device including a block provided with a bore to receive the tool shank and movable clutch members arranged within the block and adapted to project into said bore and to grip the tool shank, and a hand piece movable within the casing and extending extraneous thereof and adapted to be projected against the clutch members to force them from gripping engagement with the tool shank, and a spring interposed between said block and hand piece to normally hold the former inwardly and the latter outwardly.

10. In combination with a hammer of the 'percussive type, a casing at the front end thereof, and a clutch device arranged within the casingto engage and hold the tool with respect to outward movement and mounted for bodily movement in a direction longitudinal of the tool, said device ncluding a block provided with'a bore to receive the tool shank and also provided with circular holes one side of which enters said bore, and spring pressed balls in said -holes and projecting into the bore to grip the tool shank, and a hand piece movable within the casing and extending extraneous thereof and having a portion arranged to enter said'holes and to contact with the balls and force them from gripping engagement with the tool shank.

11. In combination with a hammer of the y percussive type, a casing at the front end thereof, and a clutch device arranged within the casing to engage and hold the tool with respect to outward movement and mounted or bodily movement in a direction longitudinal of the tool, said device including a block provided with a bore to receive the tool shank and also provided with circular holes one side of which enters said bore, and spring pressed balls in Asaid holes and Aprojecting into the bore to grip the 4tool shank, and a hand piece movable within the casing and extending extraneous thereof and having a portion arranged to enter said holes and to contact with the balls and force them from gripping engagement with the tool shank, said block andI hand piece having marginal flanges, and a spring interposed between said block and hand piece to normally hold the former inwardly and the latter outwardly.

12. In combination with a hammer of the percussive type, a casing at the front end CHARLES H. HESELR.

Witnesses:

Jos. G. DENNY, Jr.,

' GRAHAM. 

